Image forming apparatus

Details Image forming apparatus Image forming apparatus

2005-05-24

2005-05-24

Tran, Hoan (Department: 2852)

Electrophotography

Diagnostics

Document handling

C399S038000

Reexamination Certificate

active

06898383

ABSTRACT:
A control system for an image forming device includes a sensor mounted on an optical path unobstructed by elements that are subject to wear for detecting a time varying signal representing reflected light from both a photoconductive element and a transfer sheet internal to the image forming device, a memory storing reference values, and a controller to control an image forming operation based on the reference values stored in the memory and the time-varying signal received from the sensor. The controller reads the time-varying signal from the sensor and compares the time-varying signal read to the reference values to determine a condition of the image forming device.

REFERENCES:
patent: 5280322 (1994-01-01), Kono
patent: 5933677 (1999-08-01), Lee
patent: 5970274 (1999-10-01), Rath

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